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Use Property id for Array of Objects in TypeScript [Help] Getting property names of types : typescript - reddit On the face of it, recreating this functionality with Typescript should be simple. In the TypeScript world, the equivalent concept is the keyof operator. Take a simple prop function, for instance: function prop(obj, key) { return obj [key]; } It accepts an object and a key and returns the value of the . How to Use the `keyof` Type Operator in TypeScript Generics in TypeScript is almost similar to C# generics. (Typescript) Property window does not exist on type Global - NodeJS [ Glasses to protect eyes while coding : https://amzn.to/3N1ISWI ] (Typescript) Property. I don't think there's any way to generate JavaScript code from type-only TypeScript information. Setting: typescript.inlayHints.propertyDeclarationTypes.enabled my-app (tsconfig project) Setting the name property fixes the issue and the sample works as expected: Create Custom Valueof Similar to Keyof to Return Union of Property ... TypeScript understands that ginger has 2 properties, including the required breed property, so it happily considers ginger to be a Dog and compiles without a problem. I am trying to get the type of a property in another type. Typescript resolves this inconsistent . The first type we passed to the generic is the type for . In TypeScript 4.1 and onwards, you can re-map keys in mapped types with an as clause in a mapped type: type MappedTypeWithNewProperties<Type> = { [Properties in keyof Type as NewKeyType]: Type[Properties] } You can leverage features like template literal types to create new property names from prior ones: type Getters < Type > = { Announcing TypeScript 4.2 - TypeScript . This is when you define an object for a specific object without using type or an interface. For example, let's say we have a User type created with a name as a string and age as a number. In JavaScript . It creates a new array of type any, concats items to it and returns the new array. Index Signatures in TypeScript - Dmitri Pavlutin Blog We're almost there. typescript object with unknown keys and values While it won't change any behavior at runtime, a property marked as readonly can't be written to during type-checking. Problem Solution: Solution 1: declare your property in your service like below ( it is advised to use an interface instead of any, which we used here for a quick fix) products: any[] = []; Solution 2 (not recommended) : If you are a busy programmer and knows exactly what you are doing and wants to save .